class A {
   double f(double x,double y) {
     return x+y;
   }
}
class B extends A {
   double f(int x,int y) {
    return x*y;
   }
}
public class E {
   public static void main(String args[]) {
      B b=new B();
      System.out.println(b.f(3,5));
      System.out.println(b.f(3.0,5.0));
   }
}
